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ISL97632IRT14Z-T Datasheet(PDF) 4 Page - Intersil Corporation

Part # ISL97632IRT14Z-T
Description  White LED Driver with Digital Dimming
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL97632IRT14Z-T Datasheet(HTML) 4 Page - Intersil Corporation

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FN9239.3
February 22, 2008
Single-Wire Serial Interface
The ISL97632 uses a simple single-wire serial interface for
programming the output brightness of the LEDs. A 5-bit
interface is used to give a total of 32 levels of output
brightness. The interface uses a normally high connection
for use with open-drain driving schemes and Intersil’s
proprietary XSD bus. When held low for between 15µs and
45µs, the interface registers a logic 1. When held low for
between 90µs and 120µs the interface registers a logic 0.
When held low for greater that 215µs, the interface loads the
last 5 bits into the brightness control register and updates
the brightness level. The required minimum high time is 3µs.
This simple single-wire programming is summarized as
follow:
• Logic 0 = Negative pulse >90µs and <120µs
• Logic 1 = Negative pulse >15µs and <45µs
• Load = Negative pulse >215µs
Figure 1 shows an example of programming a binary code of
10100 and load it in to the device serial register.
The serial interface is automatically reset to 0 when the
device is disabled, or enters UVLO. Therefore, when the part
is enabled, the output brightness is automatically set to the
minimum level.
30µs
100µs
220µs
'1'
'0'
'1'
'0'
'0'
'LOAD'
0
200
400
600
800
1000
1200
µs
FIGURE 1. SINGLE-WIRE XSD INTERFACE
ISL97632


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